function  strNumDiscode(str) {
    str = str.replace(/&forall;/g, '∀')
    str = str.replace(/&part;/g, '∂')
    str = str.replace(/&exists;/g, '∃')
    str = str.replace(/&empty;/g, '∅')
    str = str.replace(/&nabla;/g, '∇')
    str = str.replace(/&isin;/g, '∈')
    str = str.replace(/&notin;/g, '∉')
    str = str.replace(/&ni;/g, '∋')
    str = str.replace(/&prod;/g, '∏')
    str = str.replace(/&sum;/g, '∑')
    str = str.replace(/&minus;/g, '−')
    str = str.replace(/&lowast;/g, '∗')
    str = str.replace(/&radic;/g, '√')
    str = str.replace(/&prop;/g, '∝')
    str = str.replace(/&infin;/g, '∞')
    str = str.replace(/&ang;/g, '∠')
    str = str.replace(/&and;/g, '∧')
    str = str.replace(/&or;/g, '∨')
    str = str.replace(/&cap;/g, '∩')
    str = str.replace(/&cap;/g, '∪')
    str = str.replace(/&int;/g, '∫')
    str = str.replace(/&there4;/g, '∴')
    str = str.replace(/&sim;/g, '∼')
    str = str.replace(/&cong;/g, '≅')
    str = str.replace(/&asymp;/g, '≈')
    str = str.replace(/&ne;/g, '≠')
    str = str.replace(/&le;/g, '≤')
    str = str.replace(/&ge;/g, '≥')
    str = str.replace(/&sub;/g, '⊂')
    str = str.replace(/&sup;/g, '⊃')
    str = str.replace(/&nsub;/g, '⊄')
    str = str.replace(/&sube;/g, '⊆')
    str = str.replace(/&supe;/g, '⊇')
    str = str.replace(/&oplus;/g, '⊕')
    str = str.replace(/&otimes;/g, '⊗')
    str = str.replace(/&perp;/g, '⊥')
    str = str.replace(/&sdot;/g, '⋅')
    return str
}

function strGreeceDiscode(str) {
    str = str.replace(/&Alpha;/g, 'Α')
    str = str.replace(/&Beta;/g, 'Β')
    str = str.replace(/&Gamma;/g, 'Γ')
    str = str.replace(/&Delta;/g, 'Δ')
    str = str.replace(/&Epsilon;/g, 'Ε')
    str = str.replace(/&Zeta;/g, 'Ζ')
    str = str.replace(/&Eta;/g, 'Η')
    str = str.replace(/&Theta;/g, 'Θ')
    str = str.replace(/&Iota;/g, 'Ι')
    str = str.replace(/&Kappa;/g, 'Κ')
    str = str.replace(/&Lambda;/g, 'Λ')
    str = str.replace(/&Mu;/g, 'Μ')
    str = str.replace(/&Nu;/g, 'Ν')
    str = str.replace(/&Xi;/g, 'Ν')
    str = str.replace(/&Omicron;/g, 'Ο')
    str = str.replace(/&Pi;/g, 'Π')
    str = str.replace(/&Rho;/g, 'Ρ')
    str = str.replace(/&Sigma;/g, 'Σ')
    str = str.replace(/&Tau;/g, 'Τ')
    str = str.replace(/&Upsilon;/g, 'Υ')
    str = str.replace(/&Phi;/g, 'Φ')
    str = str.replace(/&Chi;/g, 'Χ')
    str = str.replace(/&Psi;/g, 'Ψ')
    str = str.replace(/&Omega;/g, 'Ω')
    str = str.replace(/&alpha;/g, 'α')
    str = str.replace(/&beta;/g, 'β')
    str = str.replace(/&gamma;/g, 'γ')
    str = str.replace(/&delta;/g, 'δ')
    str = str.replace(/&epsilon;/g, 'ε')
    str = str.replace(/&zeta;/g, 'ζ')
    str = str.replace(/&eta;/g, 'η')
    str = str.replace(/&theta;/g, 'θ')
    str = str.replace(/&iota;/g, 'ι')
    str = str.replace(/&kappa;/g, 'κ')
    str = str.replace(/&lambda;/g, 'λ')
    str = str.replace(/&mu;/g, 'μ')
    str = str.replace(/&nu;/g, 'ν')
    str = str.replace(/&xi;/g, 'ξ')
    str = str.replace(/&omicron;/g, 'ο')
    str = str.replace(/&pi;/g, 'π')
    str = str.replace(/&rho;/g, 'ρ')
    str = str.replace(/&sigmaf;/g, 'ς')
    str = str.replace(/&sigma;/g, 'σ')
    str = str.replace(/&tau;/g, 'τ')
    str = str.replace(/&upsilon;/g, 'υ')
    str = str.replace(/&phi;/g, 'φ')
    str = str.replace(/&chi;/g, 'χ')
    str = str.replace(/&psi;/g, 'ψ')
    str = str.replace(/&omega;/g, 'ω')
    str = str.replace(/&thetasym;/g, 'ϑ')
    str = str.replace(/&upsih;/g, 'ϒ')
    str = str.replace(/&piv;/g, 'ϖ')
    str = str.replace(/&middot;/g, '·')
    return str
}

function  strcharacterDiscode(str) {
    // 加入常用解析
    str = str.replace(/&nbsp;/g, ' ')
    str = str.replace(/&quot;/g, "'")
    str = str.replace(/&amp;/g, '&')
    str = str.replace(/&lt;/g, '<')
    str = str.replace(/&gt;/g, '>')
    str = str.replace(/&#8226;/g, '•')
    return str
}

function  strOtherDiscode(str) {
    str = str.replace(/&OElig;/g, 'Œ')
    str = str.replace(/&oelig;/g, 'œ')
    str = str.replace(/&Scaron;/g, 'Š')
    str = str.replace(/&scaron;/g, 'š')
    str = str.replace(/&Yuml;/g, 'Ÿ')
    str = str.replace(/&fnof;/g, 'ƒ')
    str = str.replace(/&circ;/g, 'ˆ')
    str = str.replace(/&tilde;/g, '˜')
    str = str.replace(/&ensp;/g, '')
    str = str.replace(/&emsp;/g, '')
    str = str.replace(/&thinsp;/g, '')
    str = str.replace(/&zwnj;/g, '')
    str = str.replace(/&zwj;/g, '')
    str = str.replace(/&lrm;/g, '')
    str = str.replace(/&rlm;/g, '')
    str = str.replace(/&ndash;/g, '–')
    str = str.replace(/&mdash;/g, '—')
    str = str.replace(/&lsquo;/g, '‘')
    str = str.replace(/&rsquo;/g, '’')
    str = str.replace(/&sbquo;/g, '‚')
    str = str.replace(/&ldquo;/g, '“')
    str = str.replace(/&rdquo;/g, '”')
    str = str.replace(/&bdquo;/g, '„')
    str = str.replace(/&dagger;/g, '†')
    str = str.replace(/&Dagger;/g, '‡')
    str = str.replace(/&bull;/g, '•')
    str = str.replace(/&hellip;/g, '…')
    str = str.replace(/&permil;/g, '‰')
    str = str.replace(/&prime;/g, '′')
    str = str.replace(/&Prime;/g, '″')
    str = str.replace(/&lsaquo;/g, '‹')
    str = str.replace(/&rsaquo;/g, '›')
    str = str.replace(/&oline;/g, '‾')
    str = str.replace(/&euro;/g, '€')
    str = str.replace(/&trade;/g, '™')
    str = str.replace(/&larr;/g, '←')
    str = str.replace(/&uarr;/g, '↑')
    str = str.replace(/&rarr;/g, '→')
    str = str.replace(/&darr;/g, '↓')
    str = str.replace(/&harr;/g, '↔')
    str = str.replace(/&crarr;/g, '↵')
    str = str.replace(/&lceil;/g, '⌈')
    str = str.replace(/&rceil;/g, '⌉')
    str = str.replace(/&lfloor;/g, '⌊')
    str = str.replace(/&rfloor;/g, '⌋')
    str = str.replace(/&loz;/g, '◊')
    str = str.replace(/&spades;/g, '♠')
    str = str.replace(/&clubs;/g, '♣')
    str = str.replace(/&hearts;/g, '♥')
    str = str.replace(/&diams;/g, '♦')
    str = str.replace(/&#39;/g, '\'')
    return str
}

function strMoreDiscode(str) {
    str = str.replace(/\r\n/g, '')
    str = str.replace(/\n/g, '')
    str = str.replace(/code/g, 'wxxxcode-style')
    return str
}

function  strDiscode(str) {
    str = this.strNumDiscode(str)
    str = this.strGreeceDiscode(str)
    str = this.strcharacterDiscode(str)
    str = this.strOtherDiscode(str)
    str = this.strMoreDiscode(str)
    return str
}

function  urlToHttpUrl(url, rep) {
    const patt1 = new RegExp('^//')
    const result = patt1.test(url)
    if (result) {
      url = rep + ':' + url
    }
    return url
}

module.exports = {
  strNumDiscode: strNumDiscode,
  strGreeceDiscode: strGreeceDiscode,
  strcharacterDiscode: strcharacterDiscode,
  strOtherDiscode: strOtherDiscode,
  strMoreDiscode: strMoreDiscode,
  strDiscode: strDiscode,
  urlToHttpUrl: urlToHttpUrl,
}